1. The rock salt is grinded.
2. The grinded material is dissolved in water.
3. The liquid is filtered.
4. The solution containing sodium chloride is refinned by repeated processes of crystallization/recrystallization.
Salt is refined by the filtration of the water solution and repeated crystallization/recrystallization processes.
By filtration of the solution and crystallization/recrystallization.
A simple method involve filtering of the water solution and refining by repeated processes of crystallization/recrystallization.
Salt is refined by dissolution in water, filtering of impurities and after this by repeated steps of crystallization/recrystallization.
See the following link: http://www.sspindia.com/salt-processing-plant.html#iodised-salt-processing-plant.
A short answer: rock salt is grounded, dissolved in water, filtered, refined by repeated processes of crystallization/recrystallization.
The answer depends on what the impurities are. For example, whether or not they are water soluble.
Rock salt (impure salt) is frequently colored.
Purified salt may not be safe to eat because it may have the bacteria of the rock salt on it still. To make it pure you should boil the bacteria off the salt after it has been purified.
purified
purified
Impurities are fro the rock salt which is not a pure material; but table salt is purified up to 99 %. Some impurities are added: iodate (or iodide) of potassium and anticaking agents.
Salt that has had any contaminates removed.
It all depends on what you mean. Tap water has more salt than purified water but purified water can hold more salt if salt is added. There is more room, so to speak, for the salt ions to fit into a container.
Because salt doesn't sublime !
Yes, it is true; but the table salt (sodium chloride) is purified.
For purified salt, any difference - sodium chloride (NaCl).
If it is used as a food additive, yes.
yes